Some ponies believe in heaven; others believe in paradise. Many believe there's nothing at all. But while it is understandable for their souls to go to a place unknown, shouldn't we be able to find the bodies?
Derpy Hooves is different; so much so that everyone knows her "name". But behind her happy, ignorant exterior, is a pony that understands what people think of her...a pony that only wants to be accepted as different, not flawed.
